#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "common.h"
#include "vm.h"

static void repl() {
    char line[1024];
    for(;;) {
        printf("> ");
        if (!fgets(line, sizeof(line), stdin)) {
            printf("\n");
            break;
        }
        interpret(line);
    }
}

static char* readFile(const char *path) {
    FILE *file = fopen(path, "rb");
    if (file == NULL) {
        fprintf(stderr, "Could not open file '%s'.\n", path);
        exit(74);
    }

    fseek(file, 0L, SEEK_END);
    size_t fileSize = ftell(file);
    rewind(file);

    char *buffer = (char *)malloc(fileSize + 1);
    if (buffer == NULL) {
        fprintf(stderr, "Not enough memory to read '%s'.\n", path);
        exit(74);
    }

    size_t bytesRead = fread(buffer, sizeof(char), fileSize, file);
    if (bytesRead < fileSize) {
        fprintf(stderr, "Could not read file '%s'.\n", path);
        exit(74);
    }

    buffer[bytesRead] = '\0';

    fclose(file);

    return buffer;
}

static void runFile(const char *path) {
    char *source = readFile(path);
    // printf("%s\n", source);
    InterpretResult result = interpret(source);
    if (result == INTERPRET_COMPILE_ERROR)
        exit(65);
    if (result == INTERPRET_RUNTIME_ERROR)
        exit(70);
}

int main(int argc, const char *argv[]) {
    initVM();

    if (argc == 1) {
        repl();
    } else if (argc == 2) {
        runFile(argv[1]);
    } else {
        printf("USAGE: clox [path]\n");
    }
    freeVM();
    return 0;
}